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Add dynamic range comment to vp9_int_pro_row

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Change-Id: Icaa643568159c4e2db24eef42090b002ae02a45e
This commit is contained in:
Jingning Han 2015-06-16 14:43:21 -07:00
parent 001baa5dd8
commit 922af194bc
1 changed files with 5 additions and 2 deletions
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7
vp9/encoder/vp9_avg.c
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@ -128,15 +128,18 @@ int16_t vp9_satd_c(const int16_t *coeff, int length) {
}
// Integer projection onto row vectors.
void vp9_int_pro_row_c(int16_t *hbuf, uint8_t const *ref,
// height: value range {16, 32, 64}.
void vp9_int_pro_row_c(int16_t hbuf[16], uint8_t const *ref,
const int ref_stride, const int height) {
int idx;
const int norm_factor = MAX(8, height >> 1);
const int norm_factor = height >> 1;
for (idx = 0; idx < 16; ++idx) {
int i;
hbuf[idx] = 0;
// hbuf[idx]: 14 bit, dynamic range [0, 16320].
for (i = 0; i < height; ++i)
hbuf[idx] += ref[i * ref_stride];
// hbuf[idx]: 9 bit, dynamic range [0, 510].
hbuf[idx] /= norm_factor;
++ref;
}